Shingle-cutting machine



Sept. 16, 1930. R. G. MOIR SHINGLE CUTTING MACHINE Filed Aug. 30. 1928 Inl/enfer g. I W

Patented Sept. 16, 1930 UNITED STATES SHINGLE-GUTTNG IMAGI-Iliilt Application filed August 30,1928. Serial No. 302,910.

This invention relates to a shingle cutting machine. Its principal object is to provide a machine which cuts a shingle with a knife instead of a saw as is usually done.

Resultant objectives emerging from my improved method of producing shingles are found in the complete'elimination of sawdust, thus avoiding a serious proportion of wastage, carrying with itthe obviation of the necessity of apparatus for its removal both from the floor or from the neighboring atmosphere. v

Other objects concerned are the reduction of re risk and the surface improvement of the shingle itself, which has a clean-cut surface instead of a rough one. V

The means I adopt for securing these results may be stated broadly as consisting in the use of a revolving knife of special curved form. This is mounted upon a disc having a slot therethrough it adjacent the curved cutting edge of the knife and through which the severed shingle passes when cut off the shingle block, the latter being fed up against lthe revolving knife by suitable gear for this y purpose.

The invention is better described by the aid of the drawings accompanying and formingV la part of this application, in which Fig. 1 is a side elevation of the salient parts of a shingle cutter.

Fig. 2 is a front view. Fig. 3 is a part sectional plan on line 3-3 of Fig. 4, and y 35 Fig. 4 is a partial front view of the knife disc showing the relative positions of the knife and shingle block when the latter has been nearly cut through.

gear.l

In these drawings similar numerals indicate identical parts in the several views, and

Fig. 1A is a view of the top feed roll ratchetv and atthe same time to maintain the general K direction of the cutting in line with the centre i of the block 5 as indicated in Figs. 2 and 4.

The disc Zis slotted adjacent the cutting edge of the knife 6 to a curved path 10, as shown in Fig.47 andangularly as at 11'in Fig. 3, the purpose of which will be shown later.

. The contignous'portions of the framework ofthe machine are indicated by 12. These carry the bearing lof the main spindle 14 and the lower feed rolls 15 which support and feed forward the shingle block 5. The top feed rollsv 16 are not held in the framework butin the-adjustable yoke 17Y carried at each end by the levers 18 fulcrumed at 19 and held` against the top ofthe block extension springs 20. y

When the shingle block requires to be released from the grip of the feed rolls 15 and 16 the voke 17 is raised against the tension of the springs 2O by the lever 21 fulcrumed at 22 P" and connected to a foot plate by the rod 23. The feedrolls 15 and 16 are intermittently rotated by means of the camshaft 24 carrying the short andzlong throw cams 25 and 26. The short throw cam 25 engages the top friction roller 27 .and the corresponding bottom fric` tion roller 28 is engaged by the other cam 26. The rollers 27 andv28 are carried by the vertical rods 29 and 30 both of which latter receive vertical reciprocating motion in the guides 81 and 32 in alternate order as subsequently explained.

lin order to maintain unity of operation. in the cutting of the shingle `block in View of the required wedge-s iape section of the shingle. it is necessary to alternately tilt forward the-top and bottom of the block 5to 5 by `powerful produce thel butt of the.shinglel alternately on its top` rand bottom edge. Y

This is effected by ratchetl wheels 33 secured on the feed roils 15 a-nd 16 and rotated by ratchet lever B4'secured by spring catch on the top roll and' by ratchet lever 36 similarly connected to the bottom roll 15. The levers 34 and 36 are secured to and ac` tuated by tac rods 29 and 30, the latter rod 30 giving positive motion to the top roll 16 by downward pull controlled by the cam 26 which compresses the spring 37 whilst the corresponding but opposite motion is given ffl@ to the rod 29 actuating the bottom roll 15 by an upward motion of the rod and the er;- tension of the spring` 3S, the return motion being, effected in each case by the oppositely acting springs 37 and 38.

In operating` the machine the shingle block is inserted between the feed rolls 15 and 16 by depressi ng' the lever 21 against the top spring 2O and raising the yoke 17 and the top feed rolls 16.

The cutting disc 7 with the knife 6 attached is then rotated with the cam shaft 2l, the cams 25 and 26 being timed to respectively force upwards and downwards the feed rods 29 and 30, thus effecting a minimum and maximum feed to each feed roll in alterate order.

Having now particularly described'my invention, what claim and desire to be protected in by Letters Patent, is:

1. The combination with a shingle cutting machine, of a knife blade havingits cutting edge revolvable in a plane substantially right-angular -to the centre of the shingle block, the cutting edge of said blade forming a curve on the plane of its revolution of approximately spiral character, means in connection with the driving` gear of said machine whereby the surface of a shingle block is intermittently presented to the plane of operation of said knife at an alternate angular inclination whilst the top and bottom edges of said block are maintained in parallelism with said plane. y

2. rEhe combination withy a shingle cutting machine, of a, knife blade having its cutting edge revolvable in a) plane substantially right-angular to the centre of the shingle block, the cutting edge of said blade forming` a curve on the plane of its revolution of approximately spiral character, feed rolls on the upper and under sides of said shingle block carrying ratchet wheels, ratchet levers engaging said wheels, vertical rods jointedly secured to said levers and siidable in guides on the framework of said machine, an extension' spring and a compression spring respectively engaging each said rod whereby the return strokes of the said rods are made in opposite directions, a cam shaft operating` cant adapted to impart to each of the said Vertical rods a` short and a long' stroke in alternate order whereby the top and bottom edges of the shingle block which are parallell to the plane of the cut of the revolvable knife are alternately tilted forward towards the said plane.

ln testimony whereof I affix my signature.

ROBERT G. MOIR. 

